Details make perfection, and perfection is not a detail.

Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer.

Learning is the only thing the mind never exhausts, never fears, and never regrets.

Movement will fail sooner than usefulness.

All our knowledge originates in opinion.

A wave is never found alone, but is mingled with as many other waves as there are uneven places in the object where the said wave is produced.

Learning is the only thing that never disappoints us.